Investigation of PD electromagnetic wave characteristics in GIS

2008 ◽  
Author(s):  
Junhua Liu ◽  
Ming Yao ◽  
Chengjun Huang ◽  
Jiang Wang ◽  
Lixue Li ◽  
...  
Keyword(s):  
Electromagnetic Wave ◽  
Wave Characteristics

Floquet theory of Bragg interactions in an active medium with index modulation

1977 ◽  
Vol 55 (11) ◽  
pp. 961-971
Author(s):  
S. R. Seshadri
Keyword(s):  
Electromagnetic Wave ◽  
Dispersion Relation ◽  
Active Medium ◽  
Floquet Theory ◽  
Plane Electromagnetic Wave ◽  
Wave Characteristics ◽  
Special Cases ◽  
Index Modulation

The exact dispersion relation deduced from the Floquet theory for a plane electromagnetic wave progressing parallel to the sinusoidally varying permittivity in an unbounded, active medium is analyzed by singular expansions. For the first four orders of Bragg regions, the wave characteristics are deduced with attention given to their physical explanations. Correct results are reproduced for the special cases of zero modulation and zero gain.

scholarly journals Multifunctional composites for elastic and electromagnetic wave propagation

2020 ◽  
Vol 117 (16) ◽  
pp. 8764-8774 ◽  
Author(s):  
Jaeuk Kim ◽  
Salvatore Torquato
Keyword(s):  
Electromagnetic Wave ◽  
Effective Properties ◽  
Dynamic Properties ◽  
Broad Class ◽  
Multifunctional Composites ◽  
Central Processing ◽  
Property Relations ◽  
Wave Characteristics ◽  
Wide Range ◽  
Effective Wave

Composites are ideally suited to achieve desirable multifunctional effective properties since the best properties of different materials can be judiciously combined with designed microstructures. Here, we establish cross-property relations for two-phase composite media that link effective elastic and electromagnetic wave characteristics to one another, including the respective effective wave speeds and attenuation coefficients, which facilitate multifunctional material design. This is achieved by deriving accurate formulas for the effective electromagnetic and elastodynamic properties that depend on the wavelengths of the incident waves and the microstructure via the spectral density. Our formulas enable us to explore the wave characteristics of a broad class of disordered microstructures because they apply, unlike conventional formulas, to a wide range of incident wavelengths (i.e., well beyond the long-wavelength regime). This capability enables us to study the dynamic properties of exotic disordered “hyperuniform” composites that can have advantages over crystalline ones, such as nearly optimal, direction-independent properties and robustness against defects. We specifically show that disordered “stealthy” hyperuniform microstructures exhibit novel wave characteristics (e.g., low-pass filters that transmit waves “isotropically” up to a finite wavenumber). Our cross-property relations for the effective wave characteristics can be applied to design multifunctional composites via inverse techniques. Design examples include structural components that require high stiffness and electromagnetic absorption; heat sinks for central processing units and sound-absorbing housings for motors that have to efficiently emit thermal radiation and suppress mechanical vibrations; and nondestructive evaluation of the elastic moduli of materials from the effective dielectric response.

A method to detect the content of substance in solution by using spectral position information of photonic crystal

2021 ◽  
pp. 2150150
Author(s):  
Yun Zhang ◽  
Ze-Kun Yang ◽  
Yu-Jie Liu ◽  
Jin Xie ◽  
Lei Xia ◽  
...  
Keyword(s):  
Electromagnetic Wave ◽  
Photonic Crystal ◽  
Liquid Mixture ◽  
Wave Length ◽  
Spectral Position ◽  
Dielectric Structure ◽  
Position Information ◽  
Wave Characteristics ◽  
The Relationship ◽  
Peak Value

Photonic crystal is a dielectric structure arranged according to certain rules, and its excellent electromagnetic wave characteristics can be used to manufacture a lot of kinds of photonic crystal devices. In this paper, a defect is introduced into the photonic crystal, and the transfer matrix method is used to study the relationship between the liquid concentration and the peak value of the liquid transmission at the electromagnetic wave length when the defect is a mixture of ethanol and glycol. The results show that by observing and measuring the position of the peak transmittance of the mixed liquid, the substance content of the liquid mixture, that is, the concentration, can be inferred. The accuracy of this method is compared with the experimental results, which shows that this method has high accuracy. This method is simple and easy to operate. This result opens up a new direction for the application of photonic crystals.

The Converted Electromagnetic Wave Characteristics Of Seismoelectric Conversion Effect In Borehole

2005 ◽  
Vol 48 (2) ◽  
pp. 501-508 ◽  
Author(s):  
Yuan-Zhong ZHANG ◽  
Li-Zhi XIAO ◽  
Ze-Han CHU ◽  
Jian-Hao LI
Keyword(s):  
Electromagnetic Wave ◽  
Wave Characteristics
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